Safety laser scanner and method for front screen monitoring

Abstract

A safety laser scanner (10) for detecting objects in a monitored zone (20) is provided that has a light transmitter (12) for transmitting a scan beam (16), a movable deflection unit (18) for the periodic scanning of the monitored zone (20) by the scan beam (16), a light receiver (26) for generating a received signal from the scan beam (22) remitted by the objects, a front screen (38), and a control and evaluation unit (32) that is configured to acquire information on the objects in the monitored zone (20) from the received signal and to recognize an impaired light permeability of the front screen (38) in a front screen monitoring by evaluating a front screen reflection beam (54) that is generated from the scan beam (16) by reflection at the front screen (38), At least one light deflection unit (56, 58) is provided in the optical path of the front screen reflection beam (54) that guides the front screen reflection beam (54) to the front screen (38) again in a region (60) to be tested so that a twice-reflected front screen reflection beam (62) is produced by reflection at the region (60) to be tested.

Dependencies are inferred from the claim text.